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Pulsing noise near inverter after engine off

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by scotb, May 10, 2023.

  1. scotb

    scotb New Member

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    Vehicle:
    2008 Prius
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    LE
    On my 2008 Prius I am hearing a pulsing noise near the inverter after engine shutdown. I can also hear it sometimes when driving. Could it be coolant control valve or inverter pump or both? Or possibly something else. So far no engine codes and not too worried, but I did replace coolant control valve about 4 years ago and I wonder if that has decided to go kaput again.

    Scot
     
    #1 scotb, May 10, 2023
  2. JC91006

    JC91006 Senior Member

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    II
    if it sounds like a CD trying to eject and goes in a loop, that is the sound from the coolant control valve.
     
    #2 JC91006, May 10, 2023
    PriusCamper likes this.
  3. PriusCamper

    PriusCamper Senior Member

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    Definitely the valve... when the pump fails it's silent... The good news is you can go years without dealing with this, but it's good luck for car longevity to fix stuff soon as you notice it. Here's the one I usually buy. It's not OEM but never had any issues with 'em and only costs $40: https://www.ebay.com/itm/394097566363
     
    #3 PriusCamper, May 10, 2023
  4. Tombukt2

    Tombukt2 Senior Member

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    Vehicle:
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    Base
    Wow I better look at mine I've never touched it never replaced the water pump the belt is still intact The car never overheats the inverter pump has been replaced by something completely different that works like gangbusters and I haven't had the code for the inverter pump since and that's that so I guess I need to look into this coolant control valve that everybody seems to have had sail or whatever I've never even heard it I know the coolant tank pump and all that down in the fender well seemingly works.
     
    #4 Tombukt2, May 11, 2023
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